Operation Hardtack I was a series of 35 nuclear tests conducted by the United States from April 28 to August 18, 1958, at the Pacific Proving Grounds. The detonation of the Koa device, however, caused complete destruction of the island.

Hickory

HICKORY predicted fallout, surface radiological exclusion (radex) area, ship positions, and aircraft participation. HICKORY was detonated on June 29, 1958, at 1200. HICKORY was detonated on a barge off the west end of Enema at Bikini, 4½ hours after the OAK shot at Enewetak Atoll. The detonation cloud rose to with an estimated base, and produced a yield range.

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! Yucca

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| style="text-align:center;" | edst (12&nbsp;hrs)|| Pacific Proving Grounds

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| W-25

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  • Details of the YUCCA balloon-borne nuclear detonation published at Stratopedia, the balloon encyclopedia